clarify 7-zip only necessary on ms windows

diff --git a/guide/hausner/overview.org b/guide/hausner/overview.org
index 1b9da8b7dedee00b91a0c56c1e0fa2f80e65c26e..cffaade75c3b9c2c48e0f364be906f11c0d6fae2 100644 (file)
--- a/guide/hausner/overview.org
+++ b/guide/hausner/overview.org
@@ -35,9 +35,10 @@
 
    this is needed on MS Windows(tm) only.
 
-   if you are on Mac OS X, or GNU (on cygwin or linux), then you do
-   not need this.  your software will be able to extract the
-   class content
+   if you are on Mac OS X, or GNU (on top of cygwin or linux), then you
+   do not need this.
+   operating systems other than MS Windows can extract class content
+   with no extra software.
 
    http://7-zip.org/
 * class content